1 /*
2 * ng_socket.c
3 */
4
5 /*-
6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Julian Elischer <julian@freebsd.org>
39 *
40 * $FreeBSD$
41 * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
42 */
43
44 /*
45 * Netgraph socket nodes
46 *
47 * There are two types of netgraph sockets, control and data.
48 * Control sockets have a netgraph node, but data sockets are
49 * parasitic on control sockets, and have no node of their own.
50 */
51
52 #include <sys/param.h>
53 #include <sys/domain.h>
54 #include <sys/kernel.h>
55 #include <sys/linker.h>
56 #include <sys/lock.h>
57 #include <sys/malloc.h>
58 #include <sys/mbuf.h>
59 #include <sys/mutex.h>
60 #include <sys/priv.h>
61 #include <sys/protosw.h>
62 #include <sys/queue.h>
63 #include <sys/socket.h>
64 #include <sys/socketvar.h>
65 #include <sys/syscallsubr.h>
66 #include <sys/sysctl.h>
67 #ifdef NOTYET
68 #include <sys/vnode.h>
69 #endif
70 #include <netgraph/ng_message.h>
71 #include <netgraph/netgraph.h>
72 #include <netgraph/ng_socketvar.h>
73 #include <netgraph/ng_socket.h>
74
75 #ifdef NG_SEPARATE_MALLOC
76 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
77 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
78 #else
79 #define M_NETGRAPH_PATH M_NETGRAPH
80 #define M_NETGRAPH_SOCK M_NETGRAPH
81 #endif
82
83 /*
84 * It's Ascii-art time!
85 * +-------------+ +-------------+
86 * |socket (ctl)| |socket (data)|
87 * +-------------+ +-------------+
88 * ^ ^
89 * | |
90 * v v
91 * +-----------+ +-----------+
92 * |pcb (ctl)| |pcb (data)|
93 * +-----------+ +-----------+
94 * ^ ^
95 * | |
96 * v v
97 * +--------------------------+
98 * | Socket type private |
99 * | data |
100 * +--------------------------+
101 * ^
102 * |
103 * v
104 * +----------------+
105 * | struct ng_node |
106 * +----------------+
107 */
108
109 /* Netgraph node methods */
110 static ng_constructor_t ngs_constructor;
111 static ng_rcvmsg_t ngs_rcvmsg;
112 static ng_shutdown_t ngs_shutdown;
113 static ng_newhook_t ngs_newhook;
114 static ng_connect_t ngs_connect;
115 static ng_rcvdata_t ngs_rcvdata;
116 static ng_disconnect_t ngs_disconnect;
117
118 /* Internal methods */
119 static int ng_attach_data(struct socket *so);
120 static int ng_attach_cntl(struct socket *so);
121 static int ng_attach_common(struct socket *so, int type);
122 static void ng_detach_common(struct ngpcb *pcbp, int type);
123 static void ng_socket_free_priv(struct ngsock *priv);
124 #ifdef NOTYET
125 static int ng_internalize(struct mbuf *m, struct thread *p);
126 #endif
127 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
128 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
129
130 static int ngs_mod_event(module_t mod, int event, void *data);
131 static void ng_socket_item_applied(void *context, int error);
132
133 /* Netgraph type descriptor */
134 static struct ng_type typestruct = {
135 .version = NG_ABI_VERSION,
136 .name = NG_SOCKET_NODE_TYPE,
137 .mod_event = ngs_mod_event,
138 .constructor = ngs_constructor,
139 .rcvmsg = ngs_rcvmsg,
140 .shutdown = ngs_shutdown,
141 .newhook = ngs_newhook,
142 .connect = ngs_connect,
143 .rcvdata = ngs_rcvdata,
144 .disconnect = ngs_disconnect,
145 };
146 NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
147
148 /* Buffer space */
149 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
150 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
151 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
152 static u_long ngpdg_recvspace = 20 * 1024;
153 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
154 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
155
156 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
157
158 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */
159 #ifndef TRAP_ERROR
160 #define TRAP_ERROR
161 #endif
162
163 /***************************************************************
164 Control sockets
165 ***************************************************************/
166
167 static int
168 ngc_attach(struct socket *so, int proto, struct thread *td)
169 {
170 struct ngpcb *const pcbp = sotongpcb(so);
171 int error;
172
173 error = priv_check(td, PRIV_NETGRAPH_CONTROL);
174 if (error)
175 return (error);
176 if (pcbp != NULL)
177 return (EISCONN);
178 return (ng_attach_cntl(so));
179 }
180
181 static void
182 ngc_detach(struct socket *so)
183 {
184 struct ngpcb *const pcbp = sotongpcb(so);
185
186 KASSERT(pcbp != NULL, ("ngc_detach: pcbp == NULL"));
187 ng_detach_common(pcbp, NG_CONTROL);
188 }
189
190 static int
191 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
192 struct mbuf *control, struct thread *td)
193 {
194 struct ngpcb *const pcbp = sotongpcb(so);
195 struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
196 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
197 struct ng_mesg *msg;
198 struct mbuf *m0;
199 item_p item;
200 char *path = NULL;
201 int len, error = 0;
202 struct ng_apply_info apply;
203
204 #ifdef NOTYET
205 if (control && (error = ng_internalize(control, td))) {
206 if (pcbp->sockdata == NULL) {
207 error = ENOTCONN;
208 goto release;
209 }
210 }
211 #else /* NOTYET */
212 if (control) {
213 error = EINVAL;
214 goto release;
215 }
216 #endif /* NOTYET */
217
218 /* Require destination as there may be >= 1 hooks on this node. */
219 if (addr == NULL) {
220 error = EDESTADDRREQ;
221 goto release;
222 }
223
224 /*
225 * Allocate an expendable buffer for the path, chop off
226 * the sockaddr header, and make sure it's NUL terminated.
227 */
228 len = sap->sg_len - 2;
229 path = malloc(len + 1, M_NETGRAPH_PATH, M_WAITOK);
230 bcopy(sap->sg_data, path, len);
231 path[len] = '\0';
232
233 /*
234 * Move the actual message out of mbufs into a linear buffer.
235 * Start by adding up the size of the data. (could use mh_len?)
236 */
237 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
238 len += m0->m_len;
239
240 /*
241 * Move the data into a linear buffer as well.
242 * Messages are not delivered in mbufs.
243 */
244 msg = malloc(len + 1, M_NETGRAPH_MSG, M_WAITOK);
245 m_copydata(m, 0, len, (char *)msg);
246
247 if (msg->header.version != NG_VERSION) {
248 free(msg, M_NETGRAPH_MSG);
249 error = EINVAL;
250 goto release;
251 }
252
253 /*
254 * Hack alert!
255 * We look into the message and if it mkpeers a node of unknown type, we
256 * try to load it. We need to do this now, in syscall thread, because if
257 * message gets queued and applied later we will get panic.
258 */
259 if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
260 msg->header.cmd == NGM_MKPEER) {
261 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
262 struct ng_type *type;
263
264 if ((type = ng_findtype(mkp->type)) == NULL) {
265 char filename[NG_TYPESIZ + 3];
266 int fileid;
267
268 /* Not found, try to load it as a loadable module. */
269 snprintf(filename, sizeof(filename), "ng_%s",
270 mkp->type);
271 error = kern_kldload(curthread, filename, &fileid);
272 if (error != 0) {
273 free(msg, M_NETGRAPH_MSG);
274 goto release;
275 }
276
277 /* See if type has been loaded successfully. */
278 if ((type = ng_findtype(mkp->type)) == NULL) {
279 free(msg, M_NETGRAPH_MSG);
280 (void)kern_kldunload(curthread, fileid,
281 LINKER_UNLOAD_NORMAL);
282 error = ENXIO;
283 goto release;
284 }
285 }
286 }
287
288 item = ng_package_msg(msg, M_WAITOK);
289 if ((error = ng_address_path((pcbp->sockdata->node), item, path, 0))
290 != 0) {
291 #ifdef TRACE_MESSAGES
292 printf("ng_address_path: errx=%d\n", error);
293 #endif
294 goto release;
295 }
296
297 #ifdef TRACE_MESSAGES
298 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
299 item->el_dest->nd_ID,
300 msg->header.typecookie,
301 msg->header.cmd,
302 msg->header.cmdstr,
303 msg->header.flags,
304 msg->header.token,
305 item->el_dest->nd_type->name);
306 #endif
307 SAVE_LINE(item);
308 /*
309 * We do not want to return from syscall until the item
310 * is processed by destination node. We register callback
311 * on the item, which will update priv->error when item
312 * was applied.
313 * If ng_snd_item() has queued item, we sleep until
314 * callback wakes us up.
315 */
316 bzero(&apply, sizeof(apply));
317 apply.apply = ng_socket_item_applied;
318 apply.context = priv;
319 item->apply = &apply;
320 priv->error = -1;
321
322 error = ng_snd_item(item, 0);
323
324 mtx_lock(&priv->mtx);
325 if (priv->error == -1)
326 msleep(priv, &priv->mtx, 0, "ngsock", 0);
327 mtx_unlock(&priv->mtx);
328 KASSERT(priv->error != -1,
329 ("ng_socket: priv->error wasn't updated"));
330 error = priv->error;
331
332 release:
333 if (path != NULL)
334 free(path, M_NETGRAPH_PATH);
335 if (control != NULL)
336 m_freem(control);
337 if (m != NULL)
338 m_freem(m);
339 return (error);
340 }
341
342 static int
343 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
344 {
345 struct ngpcb *const pcbp = sotongpcb(so);
346
347 if (pcbp == 0)
348 return (EINVAL);
349 return (ng_bind(nam, pcbp));
350 }
351
352 static int
353 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
354 {
355 /*
356 * At this time refuse to do this.. it used to
357 * do something but it was undocumented and not used.
358 */
359 printf("program tried to connect control socket to remote node\n");
360 return (EINVAL);
361 }
362
363 /***************************************************************
364 Data sockets
365 ***************************************************************/
366
367 static int
368 ngd_attach(struct socket *so, int proto, struct thread *td)
369 {
370 struct ngpcb *const pcbp = sotongpcb(so);
371
372 if (pcbp != NULL)
373 return (EISCONN);
374 return (ng_attach_data(so));
375 }
376
377 static void
378 ngd_detach(struct socket *so)
379 {
380 struct ngpcb *const pcbp = sotongpcb(so);
381
382 KASSERT(pcbp != NULL, ("ngd_detach: pcbp == NULL"));
383 ng_detach_common(pcbp, NG_DATA);
384 }
385
386 static int
387 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
388 struct mbuf *control, struct thread *td)
389 {
390 struct ngpcb *const pcbp = sotongpcb(so);
391 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
392 int len, error;
393 hook_p hook = NULL;
394 char hookname[NG_HOOKSIZ];
395
396 if ((pcbp == NULL) || (control != NULL)) {
397 error = EINVAL;
398 goto release;
399 }
400 if (pcbp->sockdata == NULL) {
401 error = ENOTCONN;
402 goto release;
403 }
404
405 if (sap == NULL)
406 len = 0; /* Make compiler happy. */
407 else
408 len = sap->sg_len - 2;
409
410 /*
411 * If the user used any of these ways to not specify an address
412 * then handle specially.
413 */
414 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) {
415 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
416 error = EDESTADDRREQ;
417 goto release;
418 }
419 /*
420 * If exactly one hook exists, just use it.
421 * Special case to allow write(2) to work on an ng_socket.
422 */
423 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
424 } else {
425 if (len >= NG_HOOKSIZ) {
426 error = EINVAL;
427 goto release;
428 }
429
430 /*
431 * chop off the sockaddr header, and make sure it's NUL
432 * terminated
433 */
434 bcopy(sap->sg_data, hookname, len);
435 hookname[len] = '\0';
436
437 /* Find the correct hook from 'hookname' */
438 hook = ng_findhook(pcbp->sockdata->node, hookname);
439 if (hook == NULL) {
440 error = EHOSTUNREACH;
441 goto release;
442 }
443 }
444
445 /* Send data. */
446 NG_SEND_DATA_FLAGS(error, hook, m, NG_WAITOK);
447
448 release:
449 if (control != NULL)
450 m_freem(control);
451 if (m != NULL)
452 m_freem(m);
453 return (error);
454 }
455
456 static int
457 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
458 {
459 struct ngpcb *const pcbp = sotongpcb(so);
460
461 if (pcbp == 0)
462 return (EINVAL);
463 return (ng_connect_data(nam, pcbp));
464 }
465
466 /*
467 * Used for both data and control sockets
468 */
469 static int
470 ng_getsockaddr(struct socket *so, struct sockaddr **addr)
471 {
472 struct ngpcb *pcbp;
473 struct sockaddr_ng *sg;
474 int sg_len;
475 int error = 0;
476
477 /* Why isn't sg_data a `char[1]' ? :-( */
478 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
479
480 pcbp = sotongpcb(so);
481 if ((pcbp == NULL) || (pcbp->sockdata == NULL))
482 /* XXXGL: can this still happen? */
483 return (EINVAL);
484
485 mtx_lock(&pcbp->sockdata->mtx);
486 if (pcbp->sockdata->node != NULL) {
487 node_p node = pcbp->sockdata->node;
488 int namelen = 0; /* silence compiler! */
489
490 if (NG_NODE_HAS_NAME(node))
491 sg_len += namelen = strlen(NG_NODE_NAME(node));
492
493 sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO);
494
495 if (NG_NODE_HAS_NAME(node))
496 bcopy(NG_NODE_NAME(node), sg->sg_data, namelen);
497
498 sg->sg_len = sg_len;
499 sg->sg_family = AF_NETGRAPH;
500 *addr = (struct sockaddr *)sg;
501 mtx_unlock(&pcbp->sockdata->mtx);
502 } else {
503 mtx_unlock(&pcbp->sockdata->mtx);
504 error = EINVAL;
505 }
506
507 return (error);
508 }
509
510 /*
511 * Attach a socket to it's protocol specific partner.
512 * For a control socket, actually create a netgraph node and attach
513 * to it as well.
514 */
515
516 static int
517 ng_attach_cntl(struct socket *so)
518 {
519 struct ngsock *priv;
520 struct ngpcb *pcbp;
521 int error;
522
523 /* Allocate node private info */
524 priv = malloc(sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
525
526 /* Setup protocol control block */
527 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) {
528 free(priv, M_NETGRAPH_SOCK);
529 return (error);
530 }
531 pcbp = sotongpcb(so);
532
533 /* Link the pcb the private data. */
534 priv->ctlsock = pcbp;
535 pcbp->sockdata = priv;
536 priv->refs++;
537
538 /* Initialize mutex. */
539 mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF);
540
541 /* Make the generic node components */
542 if ((error = ng_make_node_common(&typestruct, &priv->node)) != 0) {
543 free(priv, M_NETGRAPH_SOCK);
544 ng_detach_common(pcbp, NG_CONTROL);
545 return (error);
546 }
547
548 /* Link the node and the private data. */
549 NG_NODE_SET_PRIVATE(priv->node, priv);
550 NG_NODE_REF(priv->node);
551 priv->refs++;
552
553 return (0);
554 }
555
556 static int
557 ng_attach_data(struct socket *so)
558 {
559 return (ng_attach_common(so, NG_DATA));
560 }
561
562 /*
563 * Set up a socket protocol control block.
564 * This code is shared between control and data sockets.
565 */
566 static int
567 ng_attach_common(struct socket *so, int type)
568 {
569 struct ngpcb *pcbp;
570 int error;
571
572 /* Standard socket setup stuff. */
573 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
574 if (error)
575 return (error);
576
577 /* Allocate the pcb. */
578 pcbp = malloc(sizeof(struct ngpcb), M_PCB, M_WAITOK | M_ZERO);
579 pcbp->type = type;
580
581 /* Link the pcb and the socket. */
582 so->so_pcb = (caddr_t)pcbp;
583 pcbp->ng_socket = so;
584
585 return (0);
586 }
587
588 /*
589 * Disassociate the socket from it's protocol specific
590 * partner. If it's attached to a node's private data structure,
591 * then unlink from that too. If we were the last socket attached to it,
592 * then shut down the entire node. Shared code for control and data sockets.
593 */
594 static void
595 ng_detach_common(struct ngpcb *pcbp, int which)
596 {
597 struct ngsock *priv = pcbp->sockdata;
598
599 if (priv != NULL) {
600 mtx_lock(&priv->mtx);
601
602 switch (which) {
603 case NG_CONTROL:
604 priv->ctlsock = NULL;
605 break;
606 case NG_DATA:
607 priv->datasock = NULL;
608 break;
609 default:
610 panic(__func__);
611 }
612 pcbp->sockdata = NULL;
613
614 ng_socket_free_priv(priv);
615 }
616
617 pcbp->ng_socket->so_pcb = NULL;
618 free(pcbp, M_PCB);
619 }
620
621 /*
622 * Remove a reference from node private data.
623 */
624 static void
625 ng_socket_free_priv(struct ngsock *priv)
626 {
627 mtx_assert(&priv->mtx, MA_OWNED);
628
629 priv->refs--;
630
631 if (priv->refs == 0) {
632 mtx_destroy(&priv->mtx);
633 free(priv, M_NETGRAPH_SOCK);
634 return;
635 }
636
637 if ((priv->refs == 1) && (priv->node != NULL)) {
638 node_p node = priv->node;
639
640 priv->node = NULL;
641 mtx_unlock(&priv->mtx);
642 NG_NODE_UNREF(node);
643 ng_rmnode_self(node);
644 } else
645 mtx_unlock(&priv->mtx);
646 }
647
648 #ifdef NOTYET
649 /*
650 * File descriptors can be passed into an AF_NETGRAPH socket.
651 * Note, that file descriptors cannot be passed OUT.
652 * Only character device descriptors are accepted.
653 * Character devices are useful to connect a graph to a device,
654 * which after all is the purpose of this whole system.
655 */
656 static int
657 ng_internalize(struct mbuf *control, struct thread *td)
658 {
659 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
660 struct file *fp;
661 struct vnode *vn;
662 int oldfds;
663 int fd;
664
665 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
666 cm->cmsg_len != control->m_len) {
667 TRAP_ERROR;
668 return (EINVAL);
669 }
670
671 /* Check there is only one FD. XXX what would more than one signify? */
672 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
673 if (oldfds != 1) {
674 TRAP_ERROR;
675 return (EINVAL);
676 }
677
678 /* Check that the FD given is legit. and change it to a pointer to a
679 * struct file. */
680 fd = CMSG_DATA(cm);
681 if ((error = fget(td, fd, &fp)) != 0)
682 return (error);
683
684 /* Depending on what kind of resource it is, act differently. For
685 * devices, we treat it as a file. For an AF_NETGRAPH socket,
686 * shortcut straight to the node. */
687 switch (fp->f_type) {
688 case DTYPE_VNODE:
689 vn = fp->f_data;
690 if (vn && (vn->v_type == VCHR)) {
691 /* for a VCHR, actually reference the FILE */
692 fp->f_count++;
693 /* XXX then what :) */
694 /* how to pass on to other modules? */
695 } else {
696 fdrop(fp, td);
697 TRAP_ERROR;
698 return (EINVAL);
699 }
700 break;
701 default:
702 fdrop(fp, td);
703 TRAP_ERROR;
704 return (EINVAL);
705 }
706 fdrop(fp, td);
707 return (0);
708 }
709 #endif /* NOTYET */
710
711 /*
712 * Connect the data socket to a named control socket node.
713 */
714 static int
715 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
716 {
717 struct sockaddr_ng *sap;
718 node_p farnode;
719 struct ngsock *priv;
720 int error;
721 item_p item;
722
723 /* If we are already connected, don't do it again. */
724 if (pcbp->sockdata != NULL)
725 return (EISCONN);
726
727 /*
728 * Find the target (victim) and check it doesn't already have
729 * a data socket. Also check it is a 'socket' type node.
730 * Use ng_package_data() and ng_address_path() to do this.
731 */
732
733 sap = (struct sockaddr_ng *) nam;
734 /* The item will hold the node reference. */
735 item = ng_package_data(NULL, NG_WAITOK);
736
737 if ((error = ng_address_path(NULL, item, sap->sg_data, 0)))
738 return (error); /* item is freed on failure */
739
740 /*
741 * Extract node from item and free item. Remember we now have
742 * a reference on the node. The item holds it for us.
743 * when we free the item we release the reference.
744 */
745 farnode = item->el_dest; /* shortcut */
746 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
747 NG_FREE_ITEM(item); /* drop the reference to the node */
748 return (EINVAL);
749 }
750 priv = NG_NODE_PRIVATE(farnode);
751 if (priv->datasock != NULL) {
752 NG_FREE_ITEM(item); /* drop the reference to the node */
753 return (EADDRINUSE);
754 }
755
756 /*
757 * Link the PCB and the private data struct. and note the extra
758 * reference. Drop the extra reference on the node.
759 */
760 mtx_lock(&priv->mtx);
761 priv->datasock = pcbp;
762 pcbp->sockdata = priv;
763 priv->refs++;
764 mtx_unlock(&priv->mtx);
765 NG_FREE_ITEM(item); /* drop the reference to the node */
766 return (0);
767 }
768
769 /*
770 * Binding a socket means giving the corresponding node a name
771 */
772 static int
773 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
774 {
775 struct ngsock *const priv = pcbp->sockdata;
776 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
777
778 if (priv == NULL) {
779 TRAP_ERROR;
780 return (EINVAL);
781 }
782 if ((sap->sg_len < 4) || (sap->sg_len > (NG_NODESIZ + 2)) ||
783 (sap->sg_data[0] == '\0') ||
784 (sap->sg_data[sap->sg_len - 3] != '\0')) {
785 TRAP_ERROR;
786 return (EINVAL);
787 }
788 return (ng_name_node(priv->node, sap->sg_data));
789 }
790
791 /***************************************************************
792 Netgraph node
793 ***************************************************************/
794
795 /*
796 * You can only create new nodes from the socket end of things.
797 */
798 static int
799 ngs_constructor(node_p nodep)
800 {
801 return (EINVAL);
802 }
803
804 /*
805 * We allow any hook to be connected to the node.
806 * There is no per-hook private information though.
807 */
808 static int
809 ngs_newhook(node_p node, hook_p hook, const char *name)
810 {
811 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
812 return (0);
813 }
814
815 /*
816 * If only one hook, allow read(2) and write(2) to work.
817 */
818 static int
819 ngs_connect(hook_p hook)
820 {
821 node_p node = NG_HOOK_NODE(hook);
822 struct ngsock *priv = NG_NODE_PRIVATE(node);
823
824 if ((priv->datasock) && (priv->datasock->ng_socket)) {
825 if (NG_NODE_NUMHOOKS(node) == 1)
826 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
827 else
828 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
829 }
830 return (0);
831 }
832
833 /*
834 * Incoming messages get passed up to the control socket.
835 * Unless they are for us specifically (socket_type)
836 */
837 static int
838 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
839 {
840 struct ngsock *const priv = NG_NODE_PRIVATE(node);
841 struct ngpcb *const pcbp = priv->ctlsock;
842 struct socket *so;
843 struct sockaddr_ng addr;
844 struct ng_mesg *msg;
845 struct mbuf *m;
846 ng_ID_t retaddr = NGI_RETADDR(item);
847 int addrlen;
848 int error = 0;
849
850 NGI_GET_MSG(item, msg);
851 NG_FREE_ITEM(item);
852
853 /*
854 * Only allow mesgs to be passed if we have the control socket.
855 * Data sockets can only support the generic messages.
856 */
857 if (pcbp == NULL) {
858 TRAP_ERROR;
859 NG_FREE_MSG(msg);
860 return (EINVAL);
861 }
862 so = pcbp->ng_socket;
863
864 #ifdef TRACE_MESSAGES
865 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
866 retaddr,
867 msg->header.typecookie,
868 msg->header.cmd,
869 msg->header.cmdstr,
870 msg->header.flags,
871 msg->header.token);
872 #endif
873
874 if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
875 switch (msg->header.cmd) {
876 case NGM_SOCK_CMD_NOLINGER:
877 priv->flags |= NGS_FLAG_NOLINGER;
878 break;
879 case NGM_SOCK_CMD_LINGER:
880 priv->flags &= ~NGS_FLAG_NOLINGER;
881 break;
882 default:
883 error = EINVAL; /* unknown command */
884 }
885 /* Free the message and return. */
886 NG_FREE_MSG(msg);
887 return (error);
888 }
889
890 /* Get the return address into a sockaddr. */
891 bzero(&addr, sizeof(addr));
892 addr.sg_len = sizeof(addr);
893 addr.sg_family = AF_NETGRAPH;
894 addrlen = snprintf((char *)&addr.sg_data, sizeof(addr.sg_data),
895 "[%x]:", retaddr);
896 if (addrlen < 0 || addrlen > sizeof(addr.sg_data)) {
897 printf("%s: snprintf([%x]) failed - %d\n", __func__, retaddr,
898 addrlen);
899 NG_FREE_MSG(msg);
900 return (EINVAL);
901 }
902
903 /* Copy the message itself into an mbuf chain. */
904 m = m_devget((caddr_t)msg, sizeof(struct ng_mesg) + msg->header.arglen,
905 0, NULL, NULL);
906
907 /*
908 * Here we free the message. We need to do that
909 * regardless of whether we got mbufs.
910 */
911 NG_FREE_MSG(msg);
912
913 if (m == NULL) {
914 TRAP_ERROR;
915 return (ENOBUFS);
916 }
917
918 /* Send it up to the socket. */
919 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)&addr, m, NULL) == 0) {
920 TRAP_ERROR;
921 m_freem(m);
922 return (ENOBUFS);
923 }
924 sorwakeup(so);
925
926 return (error);
927 }
928
929 /*
930 * Receive data on a hook
931 */
932 static int
933 ngs_rcvdata(hook_p hook, item_p item)
934 {
935 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
936 struct ngpcb *const pcbp = priv->datasock;
937 struct socket *so;
938 struct sockaddr_ng *addr;
939 char *addrbuf[NG_HOOKSIZ + 4];
940 int addrlen;
941 struct mbuf *m;
942
943 NGI_GET_M(item, m);
944 NG_FREE_ITEM(item);
945
946 /* If there is no data socket, black-hole it. */
947 if (pcbp == NULL) {
948 NG_FREE_M(m);
949 return (0);
950 }
951 so = pcbp->ng_socket;
952
953 /* Get the return address into a sockaddr. */
954 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */
955 addr = (struct sockaddr_ng *) addrbuf;
956 addr->sg_len = addrlen + 3;
957 addr->sg_family = AF_NETGRAPH;
958 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
959 addr->sg_data[addrlen] = '\0';
960
961 /* Try to tell the socket which hook it came in on. */
962 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)addr, m, NULL) == 0) {
963 m_freem(m);
964 TRAP_ERROR;
965 return (ENOBUFS);
966 }
967 sorwakeup(so);
968 return (0);
969 }
970
971 /*
972 * Hook disconnection
973 *
974 * For this type, removal of the last link destroys the node
975 * if the NOLINGER flag is set.
976 */
977 static int
978 ngs_disconnect(hook_p hook)
979 {
980 node_p node = NG_HOOK_NODE(hook);
981 struct ngsock *const priv = NG_NODE_PRIVATE(node);
982
983 if ((priv->datasock) && (priv->datasock->ng_socket)) {
984 if (NG_NODE_NUMHOOKS(node) == 1)
985 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
986 else
987 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
988 }
989
990 if ((priv->flags & NGS_FLAG_NOLINGER) &&
991 (NG_NODE_NUMHOOKS(node) == 0) && (NG_NODE_IS_VALID(node)))
992 ng_rmnode_self(node);
993
994 return (0);
995 }
996
997 /*
998 * Do local shutdown processing.
999 * In this case, that involves making sure the socket
1000 * knows we should be shutting down.
1001 */
1002 static int
1003 ngs_shutdown(node_p node)
1004 {
1005 struct ngsock *const priv = NG_NODE_PRIVATE(node);
1006 struct ngpcb *const dpcbp = priv->datasock;
1007 struct ngpcb *const pcbp = priv->ctlsock;
1008
1009 if (dpcbp != NULL)
1010 soisdisconnected(dpcbp->ng_socket);
1011
1012 if (pcbp != NULL)
1013 soisdisconnected(pcbp->ng_socket);
1014
1015 mtx_lock(&priv->mtx);
1016 priv->node = NULL;
1017 NG_NODE_SET_PRIVATE(node, NULL);
1018 ng_socket_free_priv(priv);
1019
1020 NG_NODE_UNREF(node);
1021 return (0);
1022 }
1023
1024 static void
1025 ng_socket_item_applied(void *context, int error)
1026 {
1027 struct ngsock *const priv = (struct ngsock *)context;
1028
1029 mtx_lock(&priv->mtx);
1030 priv->error = error;
1031 wakeup(priv);
1032 mtx_unlock(&priv->mtx);
1033
1034 }
1035
1036 static int
1037 dummy_disconnect(struct socket *so)
1038 {
1039 return (0);
1040 }
1041 /*
1042 * Control and data socket type descriptors
1043 *
1044 * XXXRW: Perhaps _close should do something?
1045 */
1046
1047 static struct pr_usrreqs ngc_usrreqs = {
1048 .pru_abort = NULL,
1049 .pru_attach = ngc_attach,
1050 .pru_bind = ngc_bind,
1051 .pru_connect = ngc_connect,
1052 .pru_detach = ngc_detach,
1053 .pru_disconnect = dummy_disconnect,
1054 .pru_peeraddr = NULL,
1055 .pru_send = ngc_send,
1056 .pru_shutdown = NULL,
1057 .pru_sockaddr = ng_getsockaddr,
1058 .pru_close = NULL,
1059 };
1060
1061 static struct pr_usrreqs ngd_usrreqs = {
1062 .pru_abort = NULL,
1063 .pru_attach = ngd_attach,
1064 .pru_bind = NULL,
1065 .pru_connect = ngd_connect,
1066 .pru_detach = ngd_detach,
1067 .pru_disconnect = dummy_disconnect,
1068 .pru_peeraddr = NULL,
1069 .pru_send = ngd_send,
1070 .pru_shutdown = NULL,
1071 .pru_sockaddr = ng_getsockaddr,
1072 .pru_close = NULL,
1073 };
1074
1075 /*
1076 * Definitions of protocols supported in the NETGRAPH domain.
1077 */
1078
1079 extern struct domain ngdomain; /* stop compiler warnings */
1080
1081 static struct protosw ngsw[] = {
1082 {
1083 .pr_type = SOCK_DGRAM,
1084 .pr_domain = &ngdomain,
1085 .pr_protocol = NG_CONTROL,
1086 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
1087 .pr_usrreqs = &ngc_usrreqs
1088 },
1089 {
1090 .pr_type = SOCK_DGRAM,
1091 .pr_domain = &ngdomain,
1092 .pr_protocol = NG_DATA,
1093 .pr_flags = PR_ATOMIC | PR_ADDR,
1094 .pr_usrreqs = &ngd_usrreqs
1095 }
1096 };
1097
1098 struct domain ngdomain = {
1099 .dom_family = AF_NETGRAPH,
1100 .dom_name = "netgraph",
1101 .dom_protosw = ngsw,
1102 .dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[0])]
1103 };
1104
1105 /*
1106 * Handle loading and unloading for this node type.
1107 * This is to handle auxiliary linkages (e.g protocol domain addition).
1108 */
1109 static int
1110 ngs_mod_event(module_t mod, int event, void *data)
1111 {
1112 int error = 0;
1113
1114 switch (event) {
1115 case MOD_LOAD:
1116 /* Register protocol domain. */
1117 net_add_domain(&ngdomain);
1118 break;
1119 case MOD_UNLOAD:
1120 #ifdef NOTYET
1121 /* Unregister protocol domain XXX can't do this yet.. */
1122 if ((error = net_rm_domain(&ngdomain)) != 0)
1123 break;
1124 else
1125 #endif
1126 error = EBUSY;
1127 break;
1128 default:
1129 error = EOPNOTSUPP;
1130 break;
1131 }
1132 return (error);
1133 }
1134
1135 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
1136 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
1137 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
1138 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
1139 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
1140
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